Java Password Generator



/** This code snippet was taken from freecodesnippets.com*/



 

/*

 * Copyright (c) Ian F. Darwin, <a href="http://www.darwinsys.com/" title="http://www.darwinsys.com/">http://www.darwinsys.com/</a>, 1996-2002.

 * All rights reserved. Software written by Ian F. Darwin and others.

 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * Java, the Duke mascot, and all variants of Suns Java "steaming coffee

 * cup" logo are trademarks of Sun Microsystems. Suns, and James Goslings,

 * pioneering role in inventing and promulgating (and standardizing) the Java

 * language and environment is gratefully acknowledged.

 *

 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for

 * inventing predecessor languages C and C++ is also gratefully acknowledged.

 */


/**

 * Cheap, lightweight, low-security password generator. See also:

 * java.security.*;

 */

public class PassPhrase {

  /** Minimum length for a decent password */

  public static final int MIN_LENGTH = 10;


  /** The random number generator. */

  protected static java.util.Random r = new java.util.Random();


  /*

   * Set of characters that is valid. Must be printable, memorable, and "wont

   * break HTML" (i.e., not  <, >, &, =, ...). or break shell commands

   * (i.e., not  <, >, $, !, ...). I, L and O are good to leave out,

   * as are numeric zero and one.

   */

  protected static char[] goodChar = { a, b, c, d, e, f, g,

      h, j, k, m, n, p, q, r, s, t, u, v, w,

      x, y, z, A, B, C, D, E, F, G, H, J, K,

      M, N, P, Q, R, S, T, U, V, W, X, Y, Z,

      2, 3, 4, 5, 6, 7, 8, 9, +, -, @, };


  /* Generate a Password object with a random password. */

  public static String getNext() {

    StringBuffer sb = new StringBuffer();

    for (int i = 0; i < MIN_LENGTH; i++) {

      sb.append(goodChar[r.nextInt(goodChar.length)]);

    }

    return sb.toString();

  }


  public static void main(String[] argv) {

    for (int i = 0; i < 20; i++) {

      System.out.println(PassPhrase.getNext());

    }

  }

}